Roll for milk-drying machines and method of making



y 1929. G. QVERTON 1.718.977

ROLL FOR MILK DRYING MACHINES AND METHOD OF MAKING Filed April 7, 1928 INVENTOR q A TTORNEY$ lowing specification.

Patented July 2, 1929.

UNITED STATES GLEN OVERTON, OF ALLEGAN, MICHIGAN.

ROLL FOR MILK-DRYING MACHINES AND METHOD OF MAKING.

Application filed April 7,

This invention relates to an improved drum for milk drying machines and the method of manufacturing the same.

The obj ects of the invention are:

First, to provide a structure of milk drying drum which shall have a substantially perfect surface and which shall be a true cylinder under operative conditions.

Second, to provide an improved construction of drum in which the steam heat will be evenly distributed"to the entire cylindrical surface.

Third, to provide an improved head con nection for such a drum.

Fourth, to provide an improved method of manufacturing such a drum which shall insure a true surface with even distribution of heat under operative conditions.

Further objects and objects pertaining to details and economies of construction will definitely appear from the description to follow.

I accomplish the objects of my invention by the devices and means described in the fol- The invention is clearly defined and pointed out in the claims.

A structure exemplifyinp my improved drum and method of manufacture is clearly illustrated in the accompanying drawing forming a part of this specification, in which:

Fig. 1 is a detail perspective view of the cast drum.

Fig. is an end view of the same with ,part of the bolt protection broken away.

Fig. 3 is a detail longitudinal sectional view on the line 33 of Fig. 2.

Fig. 4 is an enlarged detail sectional view showing details of the connection on the same line. the screw and screw head being shown in full lines.

Fig. 5 is a detail longitudinal sectional view on line 3-3 showing the second step in the process of manufacture.

Fig. 6 is a detail longitudinal section through a pair of the drum at their meeting point showing, very much exaggerated, the deformation of the drums when cold. The dotted line shows the meeting point where the drums contact when heated and expanded under the required steam pressure.

The parts will be identified by their numerals of reference which are the same in all views. I

1 is the drum of cast metal, preferably that known as semi-cast steel of very fine texture, having inwardly projecting flange 2 at each 1928. Serial No. 268,154.

end. The metal in the complete drum is machined away in an annular diagonal recess at 3 to permit the distribution of steam and the even heating of the end of the drum. The head 4 of the drum is rabbeted at 41 to fit against the flange 2 and is retained in place by a series of cap screws 5 in' the dovetail annular recess 42. This recess, after the head has been secured in place, is filled with Babbitt metal 43. presenting an entirely smooth surface which is of the highest advantage from a sanitary standpoint'in enabling the cleaning of the drums. The heads 4 are heavy castings with heavy projecting hubs and with heavy interior radial ribs" .ll: to strengthen the same and evenly distribute the heat and insure even expansion. 1

The drums are made of a high grade semisteel casting of very fine even texture. The drums illustrated are in practice 36 inches in diameter and are made heavy, the walls being cast considerably in excess of one inch thick. The drum is cast in substantially the form seen in Fig. 1. The same is then chucked in a. suitable lathev and the entire inside surface is machined away as true as it is possible to turned off and then is finished and polished smooth while under the full temperature rcqnired in operation.

By this means when the drums are installed in the milk drying machine and the required steam pressure for the proper evaporation and drying of the milk is turned on. the drums expand to perfect cylindrical form so that a pair of them so pport and airy the milk between them and deliver it downwardly in a perfectly even film as the drums rotate. lt. is thendried on the true cylindrical surface which facilitates its removal as soon as it is dried.

While I have referred to the cylinder as made of semi-cast steel, I do so because that material has been found to be very effective and economical and I wish to claim the same specifically. However, there are many mixtures of metal and it is probably possible to make use of other metal in producing casting, so I desire to claim the invention broadly as well.

Having thus described my invention. what I claim as new and desire to secure by Letters Patent is:

1. A roll for milk drying machine or similar purpose of semi-cast steel with inwardly projecting flanges and a trued inner Ina-- chined surface with annular recess at each end, an outer machined surface, a head suitably rabbeted to fit the said flange with an annular dovetail groove towards it periphery, cap screws the heads of which are disposed in said grooves, and protecting Babbitt metal cast over the said screw heads, coacting as specified.

2. A roll for milk drying machine or similar purpose of semi-cast steel with inwardly projecting flanges and a trued inner machined surface with annular recess at each end, an outer machined surface, a head suitably rabbeted to fit the said flange, cap screws, and protecting Babbitt metal cast over the said screw heads, coacting as specified.

3. A roll for milk drying machine or similar purpose of semi-cast steel with inwardly projecting flanges and a trued inner machined surface with annular recess at each end, an outer machined surface, a head suitably rabbeted to fit the said flange, and 'cap screws, coacting as specified.

4. A roll for milk drying machine or similar purpose of cast metal with inwardly projecting flanges and a trued inner machine surface with annular recess at each end, an outer machined surface, a head suitably rabbeted to fit the said flange, and cap screws, coacting as specified.

5. A roll for milk drying machine or similar purpose of cast metal with inwardly projecting flanges and a trued inner machined surface, an outer machined surface, coacting as specified.

6. The process of manufacturing a drum for milk drying machine or similar purpose comprising casting a cylinder with inwardly projecting flanges, machining the interior thereof accurately and with diagonally projecting annular recesses at each end, placing the heads in the said cylinder, chucking the same in a suitable lathe, introducing steam under the required operative pressure to expand the metal, and machining off and truing the entire exterior of the same to a true cylinder, as specified.

comprising casting a cylinder with inwardly projecting flanges, machining the interior thereof accurately and with diagonally projecting annulai recesses at each end, introducing steam under the required operative pressure to expand the metal and machining off and truing the entire exterior of the same to a true cylinder, as specified.

8. The process of manufacturing a drum for milk drying machine or similar purpose comprising, casting a cylinder with inwardly projecting flanges, machining the interior thereof accurately, placing the heads in the said cylinder, chucking the same in a suitable lathe, introducing steam under the required operative pressure to expand the metal and machining off and truing the entire cx terior of the same to a true cyilnder, as specifled.

9. The process of manufacturing a drum for milk drying machine or similar purpose comprising casting a cylinder with inwardly projecting flanges, machining the interior thereof accurately, introducing steam under the required operative pressure to expand the metal, and machining 0H and truing the entire exterior of the same to a true cylinder, as specified.

10. The process of manufacturing a drum for milk drying machine or similar purpose comprising casting a cylinder, machining the interior thereof accurately, placing the heads in the said cylinder, chucking the same in a suitable lathe, introducing steam under the required operative pressure to expand the metal, and machining off and truing the entire exterior of the same to a true cylinder, as specified.

11. The process of manufacturing a drum for milk drying machine or similar purpose comprising casting a cylinder, machining the interior thereof accurately, introducing strain under the required operative pressure to expand the metal, and machining off and trui ng the entire exterior of the same to a true cylinder, as specified.

h 1121 witness whereof I have hereunto set my GLEN OVERTON. 

